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|
Several people have asked me for the sample code I use to program
the mixer in Windows. Since it's a fairly short sample and there's
clearly some interest, I thought I'd post it directly to the newsgroup.
Here it is ... enjoy! (?)
Julian
// Example routine that manipulates the mixer controls for Win32
// This code is not a stand-alone application ...
//
// It's also not very pretty ...
//
// But then, neither is the API ...
//
// Julian Bunn, 1998, julianb@altavista.net
#include <windows.h>
#include <mmsystem.h>
MIXERCONTROLDETAILS mixDetailsMic,mixDetailsSpk,mixDetailsLin;
LONG
lMaximumSpk,lMaximumMic,lMaximumLin,lMinimumMic,lMinimumSpk,lMinimumLin;
int nMixerDevs;
int nMicMixID;
LPHMIXER hMixer;
UINT IdMixer;
/****************************************************************************
Function: ProgramInitMixer()
PURPOSE : Initialises the mixer
*****************************************************************************/
LONG WINAPI ProgramInitMixer()
{
UINT iS,iD,iDC,iC, itype;
UINT volume;
MMRESULT mmres;
MIXERCAPS mixCaps;
MIXERLINE mixLine;
MIXERLINECONTROLS mixControls;
MIXERCONTROL mixClist[50];
MIXERCONTROLDETAILS mixDetails;
MIXERCONTROLDETAILS_UNSIGNED mixValue;
MIXERCONTROLDETAILS_BOOLEAN mixMute;
MIXERCONTROLDETAILS_BOOLEAN mixBoolean[50];
MIXERCONTROLDETAILS_LISTTEXT mixList[50];
BOOL bDoneMike = FALSE;
BOOL bDoneSpkr = FALSE;
UINT LineID = 0;
if(!bMixerOpened) {
// check first if we have a mixer
if((nMixerDevs = mixerGetNumDevs()) < 1) {
return (Program_ERROR);
}
// really need to pop up a chooser for which mixer device, in
// cases where there is more than one.
// In the meantime, I select the last one listed
IdMixer = nMixerDevs-1;
mmres = mixerOpen((LPHMIXER) &hMixer, IdMixer, (DWORD) 0, (DWORD)
NULL,
MIXER_OBJECTF_MIXER);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
bMixerOpened = TRUE;
}
mmres = mixerGetDevCaps(IdMixer, (LPMIXERCAPS) &mixCaps,
sizeof(MIXERCAPS));
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
// Set the manufacturer's name for the mixer ...
SetDlgItemText(hWndDialogBox,IDC_MIXERNAME,mixCaps.szPname);
if(nMixerDevs>1) {
DialogBox(g_hInstance,MAKEINTRESOURCE(IDD_INFOMESSAGE1),
hWndDialogBox, DialogBoxCallback);
}
// Loop over the destination mixer lines
for (iD=0;iD<mixCaps.cDestinations;iD++) {
mixLine.cbStruct = sizeof(MIXERLINE);
mixLine.dwDestination = (DWORD) iD;
mixLine.dwSource = (DWORD) 0;
// Get information on this line
mmres = mixerGetLineInfo(hMixer, (LPMIXERLINE) &mixLine,
MIXER_GETLINEINFOF_DESTINATION);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
// I select types I'm interested in: the speaker output, the input
(voice and wave)
itype = 0;
if(mixLine.dwComponentType == MIXERLINE_COMPONENTTYPE_DST_SPEAKERS)
itype = 1; // Output for speakers ... only allow WAVEOUT
if(mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_DST_VOICEIN) itype = 2; // Input for ADC ...
only allow Microphone (or AUX)
if(mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_DST_WAVEIN) itype = 2; // Input for ADC ...
only allow Microphone (or AUX)
if(itype == 2 && !bMicrophone) {
itype = 3;
}
mixControls.cbStruct = sizeof(MIXERLINECONTROLS);
mixControls.dwLineID = mixLine.dwLineID;
mixControls.cControls = mixLine.cControls;
mixControls.cbmxctrl = sizeof(mixClist[0]);
mixControls.pamxctrl = (LPMIXERCONTROL) &mixClist[0];
// Get the controls for the current destination mixer line
mmres = mixerGetLineControls(hMixer,
(LPMIXERLINECONTROLS) &mixControls,
MIXER_GETLINECONTROLSF_ALL);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
for (iDC=0;iDC<mixLine.cControls;iDC++) {
// For this control, I make various checks on its type
if(mixClist[iDC].dwControlType == MIXERCONTROL_CONTROLTYPE_MUX ||
mixClist[iDC].dwControlType ==
MIXERCONTROL_CONTROLTYPE_MIXER) {
// This is a control that defines a set of connections ... get all the
types, and the values
// for the connection
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iDC].dwControlID;
mixDetails.cChannels = 1;//mixLine.cChannels;
mixDetails.hwndOwner = (HWND) mixClist[iDC].cMultipleItems;
mixDetails.cbDetails = sizeof(MIXERCONTROLDETAILS_LISTTEXT);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_LISTTEXT)
&mixList[0];
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_LISTTEXT);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iDC].dwControlID;
mixDetails.cChannels = 1;//mixLine.cChannels;
mixDetails.hwndOwner = (HWND) mixClist[iDC].cMultipleItems;
mixDetails.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_BOOLEAN)
&mixBoolean[0];
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
// In this application, I want to set only the microphone or line as
input sources ...
for(iS=0;iS<mixClist[iDC].cMultipleItems;iS++) {
mixBoolean[iS].fValue = FALSE;
if(itype == 2 && mixList[iS].dwParam2
== MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE) {
mixBoolean[iS].fValue = TRUE;
bDoneMike = TRUE;
}
if(itype == 3 && (mixList[iS].dwParam2
== MIXERLINE_COMPONENTTYPE_SRC_LINE ||
mixList[iS].dwParam2 ==
MIXERLINE_COMPONENTTYPE_SRC_AUXILIARY)) {
if(strncmp(mixList[iS].szName,"Line",4) == 0) {
mixBoolean[iS].fValue = TRUE;
bDoneMike = TRUE;
}
}
if(itype == 1 && mixList[iS].dwParam2 ==
MIXERLINE_COMPONENTTYPE_DST_SPEAKERS) {
mixBoolean[iS].fValue = TRUE;
bDoneSpkr = TRUE;
}
}
// I've prepared the settings accordingly ... now I set them in the
mixer
mmres = mixerSetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_SETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
}
if(mixClist[iDC].dwControlType == MIXERCONTROL_CONTROLTYPE_VOLUME ||
mixClist[iDC].dwControlType == MIXERCONTROL_CONTROLTYPE_TREBLE ||
mixClist[iDC].dwControlType == MIXERCONTROL_CONTROLTYPE_BASS) {
// This is a control of a volume
volume = 0;
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iDC].dwControlID;
mixDetails.cChannels = (DWORD) 1;
mixDetails.hwndOwner = NULL;
mixDetails.cbDetails = sizeof(MIXERCONTROLDETAILS_UNSIGNED);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_UNSIGNED)
&mixValue;
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
// I want to set all volumes to maximum, treble and bass boost to
minimum
if(mixClist[iDC].dwControlType ==
MIXERCONTROL_CONTROLTYPE_VOLUME) {
if(mixValue.dwValue != 0) mixValue.dwValue =
mixClist[iDC].Bounds.lMaximum;
} else {
mixValue.dwValue = mixClist[iDC].Bounds.lMinimum;
}
mmres = mixerSetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_SETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
}
if(mixClist[iDC].dwControlType == MIXERCONTROL_CONTROLTYPE_MUTE) {
// A mute control _in principle_ I've already set all these up ...
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iDC].dwControlID;
mixDetails.cChannels = (DWORD) 1;
mixDetails.hwndOwner = NULL;
mixDetails.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_BOOLEAN) &mixMute;
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_VALUE);
mixMute.fValue = mixClist[iDC].Bounds.lMinimum;
mmres = mixerSetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_SETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
}
if(mixClist[iDC].dwControlType == MIXERCONTROL_CONTROLTYPE_ONOFF) {
// An "on-off" control ... sort of like a mute, but different (used e.g
for AGC)
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iDC].dwControlID;
mixDetails.cChannels = (DWORD) 1;
mixDetails.hwndOwner = NULL;
mixDetails.cbDetails = sizeof(MIXERCONTROLDETAILS_BOOLEAN);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_BOOLEAN) &mixMute;
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
mixMute.fValue = mixClist[iDC].Bounds.lMinimum;
mmres = mixerSetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_SETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
}
}
iDC = mixLine.cConnections;
// Now I start looking over all the source lines coming into this mixer
line ..
for (iS=0;iS<iDC;iS++) {
mixLine.cbStruct = sizeof(MIXERLINE);
mixLine.dwDestination = (DWORD) iD;
mixLine.dwSource = (DWORD) iS;
mmres = mixerGetLineInfo(hMixer, (LPMIXERLINE) &mixLine,
MIXER_GETLINEINFOF_SOURCE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
mixControls.cbStruct = sizeof(MIXERLINECONTROLS);
mixControls.dwLineID = mixLine.dwLineID;
mixControls.cControls = mixLine.cControls;
mixControls.cbmxctrl = sizeof(mixClist[0]);
mixControls.pamxctrl = (LPMIXERCONTROL) &mixClist[0];
mmres = mixerGetLineControls(hMixer,
(LPMIXERLINECONTROLS) &mixControls,
MIXER_GETLINECONTROLSF_ALL);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
// for this source line ... loop over all the control. Very like what
was done above for the
// destination line ...
for(iC=0;iC<mixLine.cControls;iC++) {
if(mixClist[iC].dwControlType ==
MIXERCONTROL_CONTROLTYPE_VOLUME) {
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iC].dwControlID;
mixDetails.cChannels = (DWORD) 1;
mixDetails.hwndOwner = NULL;
mixDetails.cbDetails =
sizeof(MIXERCONTROLDETAILS_UNSIGNED);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_UNSIGNED)
&mixValue;
// I want to make a copy of the waveout, microphone, aux and line lines
for later use .... hence memcpy
if(itype == 1 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT) {
memcpy(&mixDetailsSpk,&mixDetails,sizeof(MIXERCONTROLDETAILS));
lMaximumSpk = mixClist[iC].Bounds.lMaximum;
lMinimumSpk = mixClist[iC].Bounds.lMinimum;
}
if(itype == 2 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE) {
memcpy(&mixDetailsMic,&mixDetails,sizeof(MIXERCONTROLDETAILS));
lMaximumMic = mixClist[iC].Bounds.lMaximum;
lMinimumMic = mixClist[iC].Bounds.lMinimum;
}
if(itype == 3 &&
(mixLine.dwComponentType == MIXERLINE_COMPONENTTYPE_SRC_LINE ||
mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_AUXILIARY)) {
// I'm not sure why I had to check the string like this ...
if(strncmp(mixLine.szName,"Line",4) == 0) {
memcpy(&mixDetailsLin,&mixDetails,sizeof(MIXERCONTROLDETAILS));
lMaximumLin = mixClist[iC].Bounds.lMaximum;
lMinimumLin = mixClist[iC].Bounds.lMinimum;
}
}
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
// Now I'm going to set the input levels the way I want them ..
mixValue.dwValue = mixClist[iC].Bounds.lMinimum;
if(itype == 1 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT) {
mixValue.dwValue = mixClist[iC].Bounds.lMaximum;
}
if(itype == 2 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE) {
mixValue.dwValue = mixClist[iC].Bounds.lMaximum;
}
if(itype == 3 &&
(mixLine.dwComponentType == MIXERLINE_COMPONENTTYPE_SRC_LINE ||
mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_AUXILIARY)) {
if(strncmp(mixLine.szName,"Line",4) == 0) {
mixValue.dwValue = mixClist[iC].Bounds.lMaximum;
}
}
mmres = mixerSetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_SETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
}
if(mixClist[iC].dwControlType ==
MIXERCONTROL_CONTROLTYPE_MUTE) {
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iC].dwControlID;
mixDetails.cChannels = (DWORD) 1;
mixDetails.hwndOwner = NULL;
mixDetails.cbDetails =
sizeof(MIXERCONTROLDETAILS_BOOLEAN);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_BOOLEAN)
&mixMute;
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
// I run the risk of inverting my boolean selections, so jump out if
already done ...
if(itype != 0 && (bDoneSpkr || bDoneMike)) break;
mixMute.fValue = mixClist[iC].Bounds.lMaximum;
if(itype == 1 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT) {
mixMute.fValue = mixClist[iC].Bounds.lMinimum;
}
if(itype == 2 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE) {
mixMute.fValue = mixClist[iC].Bounds.lMinimum;
}
if(itype == 3 &&
(mixLine.dwComponentType == MIXERLINE_COMPONENTTYPE_SRC_LINE ||
mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_AUXILIARY)) {
if(strncmp(mixLine.szName,"Line",4) == 0) {
mixMute.fValue = mixClist[iC].Bounds.lMinimum;
}
}
mmres = mixerSetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_SETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
}
if(mixClist[iC].dwControlType == MIXERCONTROL_CONTROLTYPE_ONOFF)
{
mixDetails.cbStruct = sizeof(MIXERCONTROLDETAILS);
mixDetails.dwControlID = mixClist[iC].dwControlID;
mixDetails.cChannels = (DWORD) 1;
mixDetails.hwndOwner = NULL;
mixDetails.cbDetails =
sizeof(MIXERCONTROLDETAILS_BOOLEAN);
mixDetails.paDetails = (LPMIXERCONTROLDETAILS_BOOLEAN)
&mixMute;
mmres = mixerGetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_GETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
mixMute.fValue = mixClist[iC].Bounds.lMinimum;
if(itype == 1 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_WAVEOUT) {
mixMute.fValue = mixClist[iC].Bounds.lMaximum;
}
if(itype == 2 && mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_MICROPHONE) {
mixMute.fValue = mixClist[iC].Bounds.lMaximum;
}
if(itype == 3 &&
(mixLine.dwComponentType == MIXERLINE_COMPONENTTYPE_SRC_LINE ||
mixLine.dwComponentType ==
MIXERLINE_COMPONENTTYPE_SRC_AUXILIARY)) {
if(strncmp(mixLine.szName,"Line",4) == 0) {
mixMute.fValue = mixClist[iC].Bounds.lMaximum;
}
}
mmres = mixerSetControlDetails(hMixer,
(LPMIXERCONTROLDETAILS) &mixDetails,
MIXER_SETCONTROLDETAILSF_VALUE);
if(mmres != MMSYSERR_NOERROR) {
return (Program_ERROR);
}
}
}
}
}
return Program_NOERROR;
}
|
